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I really hope you know what you're getting into.....Big & detailed job. I went on and posted the instructions as far as removal and installation of the timing chain. There is a whole other section that you need as far as removing the oil pan and strainer but way to much to post on here at this point. Anyhow, it's a 2 piece oil pan and just to let you know alot of the parts like the timing chain cover, oil pan, the cover on the timing chain cover does not have gaskets and Nissan doesn't either. You have to use some RTV and don't go cheap, get the good stuff because all the work that is involved in this you don't want to have to repeat because of a leak. Also the oil pump is in the timing chain cover and Nissan has had some problems in the past with them. I would suggest going online and finding a new oil pump that comes pre-installed in a new timing chain cover. You can pick the whole assembly including the cover for about $150.00 and worth it. Wish you were here I have one ready to go. Anyhow, email me at csautomotivecars@att.net and what I can do is send you the engine management section of my service manual in a PDF so you have the info on the oil pan removal.....You need it. It will also have all the stuff I am posting below so you can make it big enough to see or even print out if need be and no there isn't a cost for it. I'm in a good mood....lol. I hope this helps. Here is the timing chain instructions for you.

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After 2002 Altima offers two types of engine: the new 4 cylinder 2.5 L QR model engine which is fairly powerful (175 horsepower) and, I believe, one of the best engine in its class the 3.5L V6 VQ model engine with 240 horsepower. The same V6 model as in in the Nissan Maxima, Pathfinder and Murano.Both engines feature continuously variable valve timing using a silent chain instead of timing belt. Throttle cable is gone - the throttle operates electronically by wire based on gas pedal sensor readings. This design provides smoother transmission shifting and lower emission. The 2007 Nissan Altima 3.5L Sedan, has a Timing Chain, and an Ignition Coil Pack. NO DISTRIBUTOR.

Didn't specify what engine but if its the 4 cyl water pump is pulley driven from a belt and is easily seen and changed. If you have the 6 cylinder you will be going into the timing chains as the pump is driven by a chain. Not a do-it-yourself job.

I have a '94 Altima with 2.4 liter 4 cyl. engine. At around 150K the timing chain and tensioner were replaced - should solve your problem, too. If you're sure the chain is rattling you should really get it serviced now, not later. Also, if your car is running rough it could be more than just the chain and tensioner; it could be your ignition system, such as plugs, coil, distributor, etc. Bottom line is, your car needs to be checked out right away.